Django匹配模型选择字段到外键

Question

我正在尝试为我的大学做一个测验应用程序…我想把每个系都映射到一个院系

models.py

Class Faculty(models.Model):
faculty_choice = [
("FOE","faculty of engineering"),
("FOS","faculty of science"),
("FOA","faculty of Agriculture"),
]
faculty = models.CharField(
max_length=3,
choices=faculty_choice,
default=FOE,
)
Class Department(models.Model):
Faculty = models.FOREIGNKEY( Faculty, on_delete=CASCADE)
#this is where my problem is I don't know the next step

在工程学院，我们有其他的选择

工程学院

机械

>电气民用

理学院

数学

物理学
化学

农学院

1. 植物
3. 经济与扩展

希望我的问题足够有描述性❓

Answer 1

你做的一切都是正确的，只要在你的Department模型中创建department_name:

faculty_choice = [
("FOE", "faculty of engineering"),
("FOS", "faculty of science"),
("FOA", "faculty of Agriculture"),
]

class Faculty(models.Model):
faculty_name = models.CharField(choices=faculty_choice, default='FOE')

class Department(models.Model):
department_name = models.CharField(max_length=150)
faculty = models.ForeignKey(Faculty, on_delete=models.CASCADE, related_name='departments')

则可以从Faculty类对象中使用related_name访问部门字段。假设foe是教员对象，使用:

foe.departments.all()

将给出与foe有关系的Department模型的所有实例